121215424 has 28 divisors (see below), whose sum is σ = 262405368. Its totient is φ = 55097600.

The previous prime is 121215403. The next prime is 121215427. The reversal of 121215424 is 424512121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121215395 and 121215404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121215427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85387 + ... + 86794.

Almost surely, 2^121215424 is an apocalyptic number.

It is an amenable number.

121215424 is an abundant number, since it is smaller than the sum of its proper divisors (141189944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121215424 is a wasteful number, since it uses less digits than its factorization.

121215424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172204 (or 172194 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 121215424 is about 11009.7876455452. The cubic root of 121215424 is about 494.9020981091.

Adding to 121215424 its reverse (424512121), we get a palindrome (545727545).

The spelling of 121215424 in words is "one hundred twenty-one million, two hundred fifteen thousand, four hundred twenty-four".